package com.sky.aspect;

//自定义切面类.实现公共字段自动填充.


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

//    通知+切入点

    //    切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {

    }

    /**
     * 前置通知:在通知中进行公共字段赋值.
     */

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
//        joinPoint  切点
        log.info("开始进行公共字段字段填充.");
//         通知

        //获取到当前被拦截方法的数据库操作类型.
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名.

        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);//获得注解对象.
        OperationType value = annotation.value();//注解的值.数据库操作的值.
//      获取参数的实体对象.

        Object[] args = joinPoint.getArgs();
        if (args == null) {
            return;
        }

        Object entity = args[0];
        LocalDateTime nowTime = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
        Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
        Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
        Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
        if (value == OperationType.INSERT) {

//通过反射来赋值.
            setCreateTime.invoke(entity, nowTime);
            setCreateUser.invoke(entity, currentId);
            setUpdateTime.invoke(entity, nowTime);
            setUpdateUser.invoke(entity, currentId);
        } else if (value == OperationType.UPDATE) {

            setUpdateTime.invoke(entity, nowTime);
            setUpdateUser.invoke(entity, currentId);
        }
//      对公共字段赋值.根据不同的注解值,选择赋值.


    }
}
